共查询到20条相似文献,搜索用时 446 毫秒
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Heeg R. Kiefer T. Kugi A. Fichet O. Irastorza L. 《Industry Applications, IEEE Transactions on》2007,43(2):386-394
As the plate thickness and temperature cannot be measured directly during rolling there is a strong need for well-adapted models. The product quality can be increased by making use of measured plate data that are available from a previous pass. A feedforward control strategy is proposed to improve the regularity of the plate thickness. An accurate forward slip model is used to track the current plate position even if no velocimeter signal is available. The performance of the controller is examined using an advanced simulation model of a finishing mill. The simulation studies are based on measured plate data 相似文献
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In the process of selecting a suitable motor for a cement mill, there are several issues to consider that, for the purpose of analysis, can be grouped into two distinct categories. The first category is the technical analysis, which is based on engineering considerations that evaluate the merits of either a synchronous or a slip-ring induction motor installation. The second category is the economical analysis, which follows closely the results of the technical evaluation with emphasis on the original investment cost and the cost of operating and maintaining the equipment over its useful lifespan-estimated as 30 years. Among the technical issues, the first should be identifying the torque requirements and initial power system limitations. The choice of motor design will largely depend on these requirements. The other issues relate to electrical energy savings. With the cement mill being the largest single power consumer in the plant, the choice of motor and drive will directly influence these savings, which can be significant. Several cement mill installations in operation today are discussed 相似文献
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轧机主传动系统通常由直流电机驱动,其性能好坏直接影响板带材的产量和质量.针对轧机主传动系统存在不确定性负荷扰动和未建模动态的特点,首先建立了轧机主传动系统的模型,将不确定性负荷扰动和未建模动态视为一个综合扰动项,然后利用扩张状态观测器对综合扰动项进行观测和补偿,基于自抗扰控制技术设计了一个不依赖于对象模型的轧机速度鲁棒控制器.仿真结果表明:该控制器不仅有效地抑制了不确定负荷扰动的影响,同时对系统内部参数如电机转动惯量、电枢电阻等的摄动也具有较强的鲁棒性. 相似文献
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Sekiguchi K. Seki Y. Okitani N. Fukuda M. Critchley S. Habib W.G. Hartman D. Shaw K. 《Industry Applications, IEEE Transactions on》1996,32(3):608-616
The new coupled pickle line and cold mill (CPCM) has been processing steel since December 1991 at Dofasco Inc. in Hamilton, Ontario, Canada. This mill rolls both sheet and tin plate. The work rolls for the last stand are often textured by grit blasting to roll “matte” finished strip. A new computer-targeted control system was developed for the roll speeds and gaps, specifically for matte rolling. The new set-up system uses Stone's model, which is more appropriate for the limited reductions evident with the rougher rolls. Conventional automatic gauge control (AGC) systems using thickness measurements after the last stand are limited in performance by the effect of long transport delays. These limitations are particularly critical during mill acceleration and deceleration. The use of a thickness gauge before the stand with matte rolls allows the development of AGC systems using shorter control loops for final gauge control. The AGC system uses a Smith predictor for transport lag, (phase shift), and compensation. The combination of the shorter AGC loop and the Smith predictor allows higher gains to be used in the control system. This set-up and control system has contributed to Dofasco's position as a market leader in thickness performance 相似文献
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通过对棒材生产线粗轧后飞剪切头/尾控制程序的分析 ,找出该飞剪切头/尾不正常的原因并提出对程序的修改方案。将修改后的程序投入运行后彻底解决了该飞剪切头/尾不正常的问题 相似文献
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E型磨煤机制粉系统调整试验与分析 总被引:1,自引:0,他引:1
通过冷态下磨煤机出口一次风量的标定、热态下磨煤机出口风粉测量及煤粉系统调整测试,分析了各粉管风速、粉量偏差,根据煤粉细度对各台磨煤机折向门挡板进行调节,了解折向门-煤粉细度特性,并在典型磨煤机上进行了变风煤比等一系列调整试验,针对E型磨煤机运行特点,制定了制粉系统的优化运行方式. 相似文献
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针对西门子液压机构在运行过程中经常发生的正常与异常打压问题,从一次油压回路和二次控制回路两个角度进行了综合讨论。针对不同的异常打压,给出了具体的处理方法,尤其是一种在不影响断路器正常运行情况下的处理方法,非常有效,并得到了广泛应用。为此,设计出了一种自动排气装置,实现了自动和手动两种排气功能,能有效的减少人工排气的劳动量,提高断路器运行的可靠性。 相似文献
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中厚板轧机压下自动控制系统 总被引:2,自引:0,他引:2
介绍了安阳钢铁公司2800mm中厚板轧机压下控制系统,该系统采用计算机进行位置自动控制(APC)和厚度自动控制(AGC)联合压下控制,实现了高效率和高精度轧制。 相似文献
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辽宁东方发电有限公司2号发电机运行中产生异音,在低负荷时较严重,中间部位声音较大。经试验分析,判定该发电机异音是机械方面的风区挡板部分开焊、铁芯背部部分构件松动引起的。利用机组停机A级检修机会,对该发电机进行抽芯处理,异音情况消除,彻底解决了发电机运行中异音大的问题。 相似文献
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某热电厂300MW燃煤锅炉的制粉系统配ZGM95G型中速磨煤机,制粉系统存在煤粉细度偏大、煤粉均匀性较差和煤粉分配不均等问题,利用单一变量影响因子法进行制粉系统的优化调整试验。试验比较了磨煤机分离器挡板开度不同、加载压力不同对煤粉均匀性、煤粉细度和磨煤机电耗的影响,确定该磨煤机的分离器挡板开度应调整为53°,加载压力调整为9.0MPa,按此参数运行的煤粉均匀性指数可以达到1.16,满足运行要求。同时提出了在磨煤机分离器后加装可调式的煤粉分配设备的措施,改善了煤粉分配的均匀性,在实际运行中取得良好效果。 相似文献
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目前大型无缝钢管轧机和大型厚板轧机使用的主拖动电机大多采用可无级调速的大型直流电动机,其最大的缺点是结构复杂、制造难度大、检修维护不便。通过对4000kW交流变频同步电动机的设计进行分析与直流电动机调速性能对比,发现交流变频同步电动机具备结构简单、运行可靠的特点,实验证明完全可以取代直流电动机的工作。 相似文献